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novelty crystal radio set, 1925-1930

Radio Communication

1925-1930

Amplifying valve type V24, 1920-1922

Electronic Components

1920-1922

K.L.1 ungettered valve, 1920-1927

Electronic Components

1920-1927

S.215 dummy valve, 1920-1929

Electronic Components

1920-1929

Portions of Ronalds' electrostatic telegraph, 1816

Telecommunications

1816

Photographic contact sheet from filming of 'Something Money Can't Buy'

Photographs

1952-03-13

Key for the Model 25-7D Master clock

Collection Unassigned

M.T.9.F. dummy valve, manufactured by the M-O Valve Company Limited, Hammersmith, London, England, 1920-1929

M.T.9.F. dummy valve, 1920-1929

Electronic Components

1920-1929

M.T.9 dummy valve, manufactured by the M-O Valve Company, Hammersmith, London, England, 1920-1929

M.T.9 dummy valve, 1920-1929

Electronic Components

1920-1929

Impulse accumulator No.4028, 1950-1959. It acted to regulate the time of every unit on a Minute Impulse Time System if there was interruptions in the electricity supply to the Master Clock.

Impulse Accumulator, for use with a ITR Ltd Master Clock, 1950-1959

Time Measurement

1950-1959

Model 25-7D Master clock with special dial by International Time Recording Company Limited, and key

Model 25-7D Master clock with special dial

Time Measurement

80 H.P. Clerget, seven-cylinder, 80 hp, engine no. 1009, W.D. no. 2249. Block tube carburetter from this engine, exhibited with engine details. Built by Gwynnes Ltd.

80 H.P. Clerget, seven-cylinder, 80 hp, engine no.

Aircraft Propulsion

1913

A black and white silver gelatin photograph entitled "In Rehearsal. Ronald Hynd supports Anya Linden in a pas-de-deux while the rest of the cast snatch a rest. Royal Ballet, Hammersmith, London, circa 1962", by Michael Peto. From the Impressions Gallery exhibition "The Body Electric: An Exhibition of Ballet and Dance Photography, 1859 to the Present Day", shown 7 January - 11 February 1984

In Rehearsal, The Royal Ballet

Photographs

The prototype commercial HCN gas laser unit consisting of a discharge tube and thermally stabilised optical system capable of giving 1 mW output in the far infra-red range, 1971.

prototype HCN infra-red laser

Nuclear Physics

1970-1972

The International Superelectric Time System. Two electric movements (secondary clocks) model 561-2 with two 6" dials and two pairs 6" hands, made by International Time Recording Co, 1930-1959. They were used in the workplace to regulate time the monitor hours worked.

International Superelectric " Supervised" Secondary Clocks, 1930-1959

Time Measurement

1930-1959

Model 25-7D Master clock with special dial, figures and hands. No.21285,International Time Recording Company Ltd., London, 1950-1959. It was electrically self-winding. The Master Clock was part of a Minutue Impulse Time System, which involved other time recorders which took their time from this one.

A Master Clock, Model 25-7 by ITR Ltd, 1950-1959

Time Measurement

1950-1959